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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tika.parser.image;

import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

import org.apache.poi.util.IOUtils;
import org.apache.tika.exception.TikaException;
import org.apache.tika.io.EndianUtils;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.Photoshop;
import org.apache.tika.metadata.TIFF;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AbstractParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.sax.XHTMLContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

/**
 * Parser for the Better Portable Graphics )BPG) File Format.
 * 

* Documentation on the file format is available from * http://bellard.org/bpg/bpg_spec.txt */ public class BPGParser extends AbstractParser { protected static final int EXTENSION_TAG_EXIF = 1; protected static final int EXTENSION_TAG_ICC_PROFILE = 2; protected static final int EXTENSION_TAG_XMP = 3; protected static final int EXTENSION_TAG_THUMBNAIL = 4; private static final long serialVersionUID = -161736541253892772L; private static final Set SUPPORTED_TYPES = Collections.unmodifiableSet(new HashSet(Arrays.asList( MediaType.image("x-bpg"), MediaType.image("bpg")))); public Set getSupportedTypes(ParseContext context) { return SUPPORTED_TYPES; } public void parse( InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context) throws IOException, SAXException, TikaException { // Check for the magic header signature byte[] signature = new byte[4]; IOUtils.readFully(stream, signature); if (signature[0] == (byte) 'B' && signature[1] == (byte) 'P' && signature[2] == (byte) 'G' && signature[3] == (byte) 0xfb) { // Good, signature found } else { throw new TikaException("BPG magic signature invalid"); } // Grab and decode the first byte int pdf = stream.read(); // Pixel format: Greyscale / 4:2:0 / 4:2:2 / 4:4:4 int pixelFormat = pdf & 0x7; // TODO Identify a suitable metadata key for this // Is there an alpha plane as well as a colour plane? boolean hasAlphaPlane1 = (pdf & 0x8) == 0x8; // TODO Identify a suitable metadata key for this+hasAlphaPlane2 // Bit depth minus 8 int bitDepth = (pdf >> 4) + 8; metadata.set(TIFF.BITS_PER_SAMPLE, Integer.toString(bitDepth)); // Grab and decode the second byte int cer = stream.read(); // Colour Space: YCbCr / RGB / YCgCo / YCbCrK / CMYK int colourSpace = cer & 0x15; switch (colourSpace) { case 0: metadata.set(Photoshop.COLOR_MODE, "YCbCr Colour"); break; case 1: metadata.set(Photoshop.COLOR_MODE, "RGB Colour"); break; case 2: metadata.set(Photoshop.COLOR_MODE, "YCgCo Colour"); break; case 3: metadata.set(Photoshop.COLOR_MODE, "YCbCrK Colour"); break; case 4: metadata.set(Photoshop.COLOR_MODE, "CMYK Colour"); break; } // Are there extensions or not? boolean hasExtensions = (cer & 16) == 16; // Is the Alpha Plane 2 flag set? boolean hasAlphaPlane2 = (cer & 32) == 32; // cer then holds 2 more booleans - limited range, reserved // Width and height next int width = (int) EndianUtils.readUE7(stream); int height = (int) EndianUtils.readUE7(stream); metadata.set(TIFF.IMAGE_LENGTH, height); metadata.set(TIFF.IMAGE_WIDTH, width); // Picture Data length EndianUtils.readUE7(stream); // Extension Data Length, if extensions present long extensionDataLength = 0; if (hasExtensions) extensionDataLength = EndianUtils.readUE7(stream); // Alpha Data Length, if alpha used long alphaDataLength = 0; if (hasAlphaPlane1 || hasAlphaPlane2) alphaDataLength = EndianUtils.readUE7(stream); // Extension Data if (hasExtensions) { long extensionsDataSeen = 0; ImageMetadataExtractor metadataExtractor = new ImageMetadataExtractor(metadata); while (extensionsDataSeen < extensionDataLength) { int extensionType = (int) EndianUtils.readUE7(stream); int extensionLength = (int) EndianUtils.readUE7(stream); switch (extensionType) { case EXTENSION_TAG_EXIF: metadataExtractor.parseRawExif(stream, extensionLength, true); break; case EXTENSION_TAG_XMP: handleXMP(stream, extensionLength, metadataExtractor); break; default: stream.skip(extensionLength); } extensionsDataSeen += extensionLength; } } // HEVC Header + Data // Alpha HEVC Header + Data // We can't do anything with these parts // We don't have any helpful text, sorry... XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata); xhtml.startDocument(); xhtml.endDocument(); } protected void handleXMP(InputStream stream, int xmpLength, ImageMetadataExtractor extractor) throws IOException, TikaException, SAXException { byte[] xmp = new byte[xmpLength]; IOUtils.readFully(stream, xmp); extractor.parseRawXMP(xmp); } }





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